--Jane is seriously ill in hospital.

---Oh, sorry to hear that. I___to see her at once.

A．am going

B．am to go

C．shall go

D．am about to go

检查充电电路故障时，如果磁场外电路无故障，就将外磁场线拆下，并在磁场接柱上刮火，若有火花，则表示磁场内电路不通若无火花，则表示磁场外电路不通。